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Transformer is a power converter, not an amplifier ..
If voltage is doubled in the secondary, current is halved in the secondary. Conversely, if voltage is halved in the secondary, current is doubled in the secondary. In this manner, all the power delivered to the primary by the source is also delivered to the load by the secondary minus whatever power is consumed by the transformer in the form of losses ..
As said above transformer is not an amplifier. But the propertie of voltage transformation can be used as step-up booster where secondary voltage is higher than primary voltage. Secondary load impedance must be higher than prinary one or it should be highohmic.
its not an amplifier, because the output and input powers are same.. and there is not another source other than the signal (e.g incomming ac voltage), which can upconvert the signal voltage without reducing the output current...